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(a) Synchrotron XRD pattern (black) and best fit (purple, 2θ range of 3–30°; λ = 0.565 483 Å) for FAPbI3 NCs using the cubic lattice, yielding a refined cell parameter of a = 6.3641 Å. The inset illustrates the cubic perovskite structure of FAPbI3 and the off-axis disorder of the I– anions. (b, c) High-resolution TEM images of FAPbI3 NCs; (d) typical TEM image of FAPbI3 NCs; (f) aspect ratio histogram for FAPbI3 NCs.
